#include "LKH.h"
#include "Segment.h"

GainType Penalty_VRPB() {
  static Node* StartRoute = 0;
  Node *N, *NextN, *CurrentRoute;
  GainType DemandSum[2], P = 0;
  int Linehauls, Backhauls;
  int Forward = SUCC(Depot)->Id != Depot->Id + DimensionSaved;

  if (!StartRoute) StartRoute = Depot;
  if (StartRoute->Id > DimensionSaved) StartRoute -= DimensionSaved;
  N = StartRoute;
  do {
    CurrentRoute = N;
    DemandSum[0] = DemandSum[1] = 0;
    Linehauls = Backhauls = 0;
    NextN = Forward ? SUCC(N) : PREDD(N);
    do {
      if (N->Id <= Dim && N != Depot) {
        if (N->Backhaul) {
          Backhauls++;
          if (Linehauls == 0) P += 1000000;
        } else {
          Linehauls++;
          if (Backhauls > 0) P += 1000000;
        }
        if ((DemandSum[N->Backhaul] += N->Demand) > Capacity)
          P += DemandSum[N->Backhaul] - Capacity;
        if (P > CurrentPenalty || (P == CurrentPenalty && CurrentGain <= 0)) {
          StartRoute = CurrentRoute;
          return CurrentPenalty + (CurrentGain > 0);
        }
      }
      N = Forward ? SUCC(N) : PREDD(N);
    } while (N->DepotId == 0);
  } while (N != StartRoute);
  return P;
}
